Genetic variations at ABCG5/G8 genes modulate plasma lipids concentrations in patients with familial hypercholesterolemia

Atherosclerosis. 2010 Jun;210(2):486-92. doi: 10.1016/j.atherosclerosis.2010.01.010. Epub 2010 Jan 22.

Abstract

Objective: To investigate the association of four common single nucleotide polymorphisms (SNPs) at ABCG5 (i7892A>G, i18429C>T, Gln604GluC>G, i11836G>A) and five at ABCG8 (5U145T>G, Tyr54CysA>G, Asp19HisG>C, i14222T>C, and Thr400LysG>T) with plasma lipids concentrations and to explore the interaction between those SNPs and smoking in patients with FH.

Methods and results: ABCG5/G8 SNPs were genotyped in 500 subjects with genetic diagnosis of FH. Carriers of the minor A allele at the ABCG5_i11836G>A SNP displayed significantly higher HDL-C concentrations (P=0.023) than G/G subjects. In addition, carriers of the minor G allele at the ABCG5_Gln604GluC>G SNP had significantly lower VLDL-C (P=0.011) and lower TG (P=0.017) concentrations than homozygous C/C. Interestingly, a significant gene-smoking interaction was found, in which carriers of the minor alleles at ABCG5 (i7892A>G, i18429C>T, i11836G>A) SNPs displayed significantly lower HDL-C, higher TC and higher TG respectively, only in smokers. On the other hand, nonsmokers carriers of the minor alleles at ABCG5 (i18429C>T and Gln604GluC>G) SNPs had significantly lower TG concentrations (P=0.012 and P=0.035) compared with homozygous for the major allele.

Conclusions: Our data support the notion that ABCG5/G8 genetic variants modulate plasma lipids concentrations in patients with FH and confirm that this effect could be influenced by smoking. Therefore, these results suggest that gene-environmental interactions can affect the clinical phenotype of FH.

MeSH terms

  • ATP Binding Cassette Transporter, Subfamily G, Member 5
  • ATP Binding Cassette Transporter, Subfamily G, Member 8
  • ATP-Binding Cassette Transporters / genetics*
  • Adult
  • Alleles
  • Cohort Studies
  • Family Health
  • Female
  • Gene Expression Regulation*
  • Genotype
  • Humans
  • Hypercholesterolemia / genetics*
  • Lipids / blood*
  • Lipids / chemistry
  • Lipoproteins / genetics*
  • Male
  • Middle Aged
  • Models, Biological
  • Models, Genetic
  • Polymorphism, Single Nucleotide*
  • Smoking

Substances

  • ABCG5 protein, human
  • ABCG8 protein, human
  • ATP Binding Cassette Transporter, Subfamily G, Member 5
  • ATP Binding Cassette Transporter, Subfamily G, Member 8
  • ATP-Binding Cassette Transporters
  • Lipids
  • Lipoproteins